Monday marked a big day for Germany's history: As of Feb. 5, 2018, the Berlin Wall has been torn down for longer than it stood dividing East and West Germany.

Gerard Malie / AFP / Getty Images

For nearly three decades, the wall kept East Berliners from fleeing their half of the divided city, keeping them inside communist East Germany, even as West Berlin was under capitalist control. But in 1989 the symbol of Cold War division finally fell as protesters, then the government itself, ripped it down.

This was, rightly, a huge day in Germany, where they even came up with a name for the event: Zirkeltag.

One simple tweet in particular, sent out by user @GuyMazzeo on Jan. 7, garnered more than 6,000 retweets.

But nope, the milestone finally came around for real on Monday. And according to Peter Sparding of the German Marshall Fund, the dates related to the Berlin Wall are extremely clear in Germany.

Reuters

"In Germany the dates are very clear I think that mark the start of when it was built and the fall," Sparding, who hadn't seen the previous tweets, told BuzzFeed News in a phone interview. "Aug. 13, 1961, is generally seen as the date it was built, of course, but it wasn't built in a day, so I wonder if that's what people are confused about."

"And then the date it came down is Nov. 9, [1989], so there might be some confusion because that's when it was first opened," he said.

In a later email exchange, Sparding supposed that someone could have done the math and been off by exactly one month, sparking the chain reaction that led us to today.

Fabrizio Bensch / Reuters

In any case, welcome to the post–post–Berlin Wall era everyone! For real!

Wolfgang Rattay / Reuters

Hayes Brown is a world news editor and reporter for BuzzFeed News and is based in New York.